Swain says just four extrasolar planets' atmospheres have been studied in detail with spectroscopy, a chemical analysis technique. Another 32 or so have been observed.
2
采用化学分析、金相检验、光谱分析等方法对20钢轴套的自由锻件表面产生的龟裂进行了分析。
The surface craze of 20 steel axle sleeve in free forging was analyzed by chemical , spectrum and miscrostructure analysis.
3
通过化学分析、红外光谱分析等手段确定了高固和低氯pae的结构。
The structure of PAE with high and low solids content was found out by chemical analysis and IR spectrum.